As do apples. And the core is perfectly in the middle. The seeds are not dispersed through the fruit, making it uneatable, and the stem is lined up perfectly with the part you don't eat. God it's awesome.

Came to mind, read if you like, skip if you don't. Just a nugget of wisdom about Coconuts from Douglas Adams:

Exerpt from 'Last Chance to See,' written by Douglas Noel Adams and Mark Carwardine: (this was written after describing the troubling scene of watching an infant goat be torn apart and devoured by the endangered Komodo dragons he had taken a truly aggravating voyage just for the opportunity of seeing)
"For all my rational Western intellect and education, i was for the moment overwhelmed by a primitive sense of living in a world ordered by a malign and perverted god, and it coloured my view of everything that afternoon-- even the coconuts. The villagers sold us some and split them open for us. They are almost perfectly designed. You first make a hole and drink the milk, then you split open the nut with a machete and slice off a segment of the shell, which forms a perfect implement for scooping out the coconut flesh inside. What makes you wonder about the nature of this god character is that he creates something that is so perfectly designed to be of benefit to human beings and then hangs it twenty feet above their heads on a tree with no branches:
'Here's a good trick, let's see how they cope with this. Oh, look! they've managed to find a way of climbing the tree. i didn't think they'd be able to do that. All right, let's see them get the thing open. Hmm, so they've figured out how to temper steel now, have they? Okay, no more Mr. Nice Guy. Next time they go up that tree, I'll have a dragon waiting for them at the bottom.'

I really, really think we should be best friends. Life, The Universe, and Everything was one of the first books I remember reading as a kid (probably before I should have). I worked my way backwards through the Hitchhiker's series, and enjoyed it in both directions.

Look up Daniel Pinkwater; I think you'll like him. Borgel is a particular favorite of his for me, as is Lizard Music.

It could be due to selective breeding by cultivation, seeing as how we've humans have been doing the same with bananas for thousands of years, which has made them seedless and adapt to fit the human palm, (Fittingly, bananas could potentially be considered extinct, most bananas we eat today are just cloned seeds). Science is fun.

most (not sure of all) bananas are the product of thousands of years of selective breeding to the point now where they are propagated from cuttings rather than sexual reproduction and seeding, so that there are only a limited number of strains of bananas and all examples of any particular strain are clones in the sense that they are parts of the parent plant rather than descendants of it, not that they are artificially created in a lab or something.